public class Example4_7 {
    public static void main(String args[] ) {
	Battery nanfu = new Battery(100);
	System.out.println("南孚电池的储电量是:"+nanfu.electricityAmount);
	Radio radio = new Radio();
	System.out.println("收音机开始使用南孚电池");
	radio.openRadio(nanfu);
	System.out.println("目前南孚电池的储电量是:"+nanfu.electricityAmount);
	}
}

